A good thread over at SEO Chat, entitled How Internet Phenomenon Gain Links Over Time, started by Randfish, is a great read. He discusses Acceleration and Deceleration of Link Gain Speed, Anchor Text, On-Topic Pages, and Sitewides, with some theories on how we can use this information to obtain more natural looking backlinks. Run on over and check out the thread at http://forums.seochat.com/t48762/s.html.